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Sun Jiajun of China competes during the men's 100m breaststroke final at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina on Oct. 8, 2018. Sun Jiajun won the gold. (Xinhua/Zhu Zheng)
Sun Jiajun of China competes during the men's 100m breaststroke final at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina on Oct. 8, 2018. Sun Jiajun won the gold. (Xinhua/Zhu Zheng)